Introduction

Dixon, Simon; Hall, C. A.

doi:10.1016/b978-0-12-415954-9.00001-2

Cited by 21 publications

(36 citation statements)

References 4 publications

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“…As discussed in detail in Vad, 29 supported by a literature survey incorporating e.g. Carolus 21 and Dixon, 30 the simplified 2D cascade flow approach is widely used in preliminary aerodynamic design and analysis of axial flow rotors. This applies even for rotors of non-free vortex operation associated with 3D interblade flow phenomena.…”

Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

“…For obtaining further aerodynamic characteristics along the span, 2D empirical cascade correlations established by Howell, and cited in Dixon, 30 were taken as basis. As an approximation suggested in Carolus, 21 the change of the axial velocity profile ϕ ( R ) was neglected through the rotor, in accordance with the 2D approach.…”

Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

“…Given that the blade geometry generally differs from the nominal one, the outlet flow angle has been corrected, relative to the preliminarily calculated nominal value. This was carried out on the basis of the “off-design performance” graph by Howell, 30 using the linear approximation suggested by the graph, and considering the comments in Lewis 31 on cascade correlations. With knowledge of the outlet flow angle and the axial velocity, the outlet tangential velocity, the Euler work, and the isentropic total pressure rise were calculated.…”

Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

“…Lieblein 36 established a strong correlation between the D diffusion factor 21,30,37 and the wake momentum thickness θ normalized by the blade chord c . In Vad, 35 the following empirical formula has been proposed for this correlation …”

Section: Correlation Between Local Indicators Of Noise and Loss Alongmentioning

confidence: 99%

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An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique

Benedek

Vad

2016

International Journal of Aeroacoustics

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A combined acoustic-aerodynamic diagnostics methodology is presented herein, involving the phased array microphone technique and an in-house rotating source identifier processing algorithm. The methodology makes possible the industrial onsite investigation of unducted or short-ducted rotor-only axial fans. Its application is illustrated in a case study of a free-inlet, free-exhausting fan, surveyed from the upstream direction. A methodology is outlined for guaranteeing the appropriateness of averaging of the phased array microphone records. A technique is proposed for eliminating the ambiguity of the angular position of the rotor noise sources. A complete set of noise source maps of various frequencies have been evaluated. Noise sources, such as tip leakage flow and suction side blade boundary layer flow, have been identified. Empirical correlations have been pointed out between indicators of aerodynamic noise and aerodynamic loss along the blade span. Such correlations may contribute to redesign guidelines for simultaneous reduction of noise and improvement of efficiency at prescribed fan performance.

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Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

Section: Aerodynamic Characteristics Along the Blade Spanmentioning

confidence: 99%

Section: Correlation Between Local Indicators Of Noise and Loss Alongmentioning

confidence: 99%

See 2 more Smart Citations

An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique

Benedek

Vad

2016

International Journal of Aeroacoustics

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“…This calculation flow chart explains the energy transform from the flywheel to the pump. It is assumed that the affinity laws of the pump are satisfied in the overall pump coastdown range and that the impeller diameter is a constant [4]. However, the hydraulic efficiency of the pump worsens when the impeller rotating speed is gradually decreased.…”

Section: Pump Flywheelmentioning

confidence: 99%

An Innovative Passive Residual Heat Removal System of an Open-Pool Type Research Reactor with Pump Flywheel and Gravity Core Cooling Tank

Lee

Yoon

2015

Science and Technology of Nuclear Installations

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In an open-pool type research reactor, the primary cooling system can be designed to have a downward flow inside the core during normal operation because of the plate type fuel geometry. There is a flow inversion inside the core from the downward flow by the inertia force of the primary coolant to the upward flow by the natural circulation when the pump is turned off. To delay the flow inversion time, an innovative passive system with pump flywheel and GCCT is developed to remove the residual heat. Before the primary cooling pump starts up, the water level of the GCCT is the same as that of the reactor pool. During the primary cooling pump operation, the water in the GCCT is moved into the reactor pool because of the pump suction head. After the pump stops, the potential head generates a downward flow inside the core by moving the water from the reactor pool to the GCCT and removes the residual heat. When the water levels of the two pools are the same again, the core flow has an inversion of the flow direction, and natural circulation is developed through the flap valves.

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Optimized geometry design of a radial impulse turbine for OWC wave energy converters

Saad

Díaz

Pereiras

et al. 2021

Applied Ocean Research

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Introduction

Cited by 21 publications

References 4 publications

An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique

An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique

An Innovative Passive Residual Heat Removal System of an Open-Pool Type Research Reactor with Pump Flywheel and Gravity Core Cooling Tank

Optimized geometry design of a radial impulse turbine for OWC wave energy converters

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